Sand elevator



ly 9- E. o. BEARDSLEY ET AL 1,719L49'6 SAND ELEVATOR Filed Feb. 19, 1926 2 Sheets-Sheet l as El #35 y 1929. E. o. BQEARDSLEY ET AL 1.719.496

SAND ELEVATOR I Filed Feb. 1 1926 2 Shets-Shefl 2 gZZ Patented July 2, 1929.

UNITED STATES PATENT OFFICE.

ELMER O. BEARDSLEY AND WALTER F. PIPER, OF CHICAGO, ILLINOIS, ASSIGNORS TO THE BEARDSLEY & PIPER COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SAND ELEVATOR.

The invention relates to sand elevators and more particularly to elevators for use in connection with magnetic separators.

In foundries, in which moulding machines of the sand-slinger type are used, it is desirable in some instances to associate, with an elevator for feeding sand to the machine,

means for separating scrap and the like from the sand while it is being elevated for delivery to the machine, and the primary object of the invention is to provide a construction of conveyor which is adapted to serve as an elevator, and which is provided at its upper or discharge end with a magnetic separator which will separate the scrap from the sand, prevent it from being fed to the moulding machine, and discharge it into a separate chute.

Another object of the invention is to provide a magnetic separator which comprises a series of elevator buckets which are adapted to pass around a magnetic drum at the upper end of the elevator. Other objects of the invention will appear from the specification.

A further object of the invention is to provide an endless conveyor having buckets and a. drive sprocket of new and improved construction.

The invention consists in the several novel features hereinafter set forth and more particularly defined by the claims at the conclusion hereof.

In the drawings: Fig. 1 is a view, partly in elevation and partly in section, of apparatus embodying the invention. Fig. 2 is a detail section through the separating drum. Fig. 3 is an enlarged section through the drum and elevator buckets. Fig. 4 is a detail of some of the buckets. Fig. 5 is a perspective of one of the elevator buckets. Fig. 6 is a view showing the drive sprocket with the buckets thereon in section. Fig. 7 is a section on line 77 of Fig. 6.

The invention is exemplified in connection with asand handling and moulding machine, more fully illustrated and described in an application filed by us of even date herewith,.serial No. 89,274, in which sand is to be delivered from a trough 10 formed above a rotatable reservoir bottom-11 to an endless belt 12 mounted on pulleys 13. The belt 12 is usually mounted to move with the moulding machine so it can be moved horizontally as the projector-head is correspondingly shifted to project wads of sand into all portions of a flask, as more fully set forth in said application.

The improved elevator comprises an endless series of buckets 14 which are pivotally connected to one anotherv by rods 15,. Each bucket comprises integral end walls 16, outwardly flared front and rear walls 17 and 18, pivot-lugs 19' at either end and a closed bottom 20. At the bottom corners, each bucket is formed with pockets 21, the outer ends of which are open to receive the lugs 19 of the adjoining bucket and conforming substantially thereto. A rod 15 extends through lugs 19 of each bucket and through the bucket walls forming the inner ends of the pockets and over the intermediate portion of the bottom of the adjacent bucket to pivotally and serially connect the buckets. Cotter pins 22 hold each rod 15 against withdrawal from lugs 19. The elevator is driven by a sprocket-wheel 24 which is preferably formed in, sections and clamped to a driveshaft 25. Said shaft may be driven by any suitable means as exemplified in the aforesaid application No. 89,274. The sprocketwheel comprises a central web 26 and inte-. gral longitudinally extending members or bars 27 projectin from both sides thereof to extend across'tiie elevator buckets and between ribs 16 which are integrally formed with the elevator buckets, so that the buckets will be confined against endwise movement on the sprocket. Each cross-bar 27 is formed with a seat or recess 28 extending from end to end thereof to receive the por tion 29 of the pivot lugs 19 of one bucket and the intermediate curved portion of the bottom 20 of the contiguous bucket, so that portions of two buckets will be simultaneously seated on the cross-bars of the sprocket, to' insure an effective driving relation. Ribs 31 are formed between the bars 27 and the web 26. These buckets, in passing around drive-sprocket 24, are filled with sand and pass from there upwardly to elevate it for discharge onto the conveyor-belt 12. At the upper end of the elevator, the buckets pass around a magnetic idler pulley 32 which is fixed to rotate with a shaft 33 which is mountedin bearings 34. The bearings 34 are carried'by'arms 35 which are pivoted to a shaft 36 which is supported by a suitable frame structure 37. Springs 38 are applied between the frame structure and the arms 35, to force the arms upwardly and keep the elevator taut under all conditions, and to insure the rotation of the pulley 32 by the elevator. As the buckets pass over and around with pulley 32, the sandwill be discharged into a chute 39 which will deliver it onto the feed-belt 13.

The magnetic pulley comprises suitable windings 40 around the shaft 33 and insulated therefrom and which are electrically connected to suitable brushes in a casing 41, so that current will be continuously supplied to the windings while the shaft and pulley are rotating. The pulley also comprises side plates 42, a brass circumferential band 43 and rings 44 which are provided with inwardly extending flanges which are bolted to the side plates 42, and, with outer peripheral ribs or flanges 45' between, which the buckets fit so they will be confined against axial movement relatively to, and by, the drum. These rings are made of manganese steel containing approximately twelve per cent (12%) of manganese. The buckets are also made of similar manganese steel so that they will be substantially non-magnetic.

When any scrap or magnetic material is picked up by the buckets, it will come within the range of the magnetic flux produced by the energization in the windings 40 and be thereby retained in the bucket until after the sand has been discharged and the buckets have passed a sufficient distance away from the magnetic pulley and out ofthe magnetic flow, whereupon, they will drop into the chute 47 and be deposited at some convenient point away from the sand.

The invention exemplifies separating apparatus adapted for use in foundries, and in which separation is elfected of the sand and scrap which is conveyed in buckets, so that the endless conveyor may be used to elevate the material to a point where the sand will be conveniently discharged to the feed mechanism for the moulding machine; also apparatus in which the buckets are interfitting so as to form a substantially continuous endless conveying element. In practice, it has been found that when the buckets are formed of manganese steel of approximately twelve per cent (12%) manganese, the scrap will not retain residual magnetism, but will be promptly released as the buckets leave the magnetic pulley, so that there is no likelihood of the scrap being carried back into the sand supply by the bucks ets or to fall into said supply.

The invention is not to be understood as restricted to the details set forth, since these may be modified within the scope of the a pended claims,'without departing from t. e spirit and scope of the invention.

Having thus described the invention, what we claim as new and desire to secure by Letters Patent, is:

1. An endless conveyor comprising a series of buckets each being provided with pivotlugs and means forming pockets in its bottom corners positioned inwardly of tho bucket-bottom and shaped to receive the lugs on the adjoining bucket, pivot-rods each extending through the lugs of one bucket and the pocket-forming means of the adjoining bucket, a drive sprocket for supporting the buckets at one end of said conveyor, and means for supporting said buckets at the other end of the conveyor.

2. An endless conveyor comprising a series of buckets each being provided with substantially cylindrical pivot-lugs disposed outwardly of and adjacent the entrance part of its rear wall and means forming pockets in its bottom corners shaped to receive the lugs on the adjoining bucket, pivot-rods each extending through the lugs on one bucket and the pocket-forming means of the adjoining bucket, a drive sprocket for supporting the buckets at one end of said conveyor, said sprocket being provided with seats for receiving the pivot-lugs on the buckets, and a means for supporting said buckets at the other end of the conveyor.

3. An endless conveyor comprising a series of buckets each embodying substantially cylindrical pivotlugs, a curved bottom and means forming pockets in its bottom corners shaped to receive the lugs on the adjoining bucket, pivot-rods extending through the lugs of one bucket and the pocket-forming means of the adjoining bucket respectively, a drive sprocket for supporting the buckets at one end of said conveyor, said sprocket being provided with cross bars having seats conforming to and for receiving the bottom and lugs of the buckets, and means for supporting the buckets at the other end of the conveyor.

4. An endless conveyor comprising a series of buckets each of which is provided with pivot-lugs and with side ribs connected to the lugs, and is formed with pockets in its bottom corners into which the ivot-lugs of the adjoining bucket extend, pivot-rods extending through the lugs of one bucket and the bottom portion of the adjoining bucket respectively, a drive sprocket for supporting the buckets at one end thereof, said sprocket comprising cross bars extending between said ribsand provided with seats for receiving the bottom portions of the buckets, and a pulley for supporting the buckets at the other end thereof.

5. An endless conveyor com rising a series of buckets each consisting o a front wall, a rear wall, a bottom connecting wall, side walls, pivot-lugs formed integrally with the rear wall and side walls and projecting rearwardly with respect thereto and means integral with the side and bottom walls forming pockets disposed inwardly of said bottom wall, and shaped to receive the pivotlugs on the adjoining bucket, pivot-rods each extending through the pivot-lugs of one bucket and a pocket-forming means of the adjoining bucket, the intermediate portions of said pivot-rods being positioned inwardly ELMER O. BEARDSLEY. WALTER F. PIPER. 

